MuscleNerd of iphone-dev has been updating us via his twitter account with some info about firmware 2.2.1 which was released yesterday.

2.2.1 does not break the dev team's methods of jailbreak.

2.2.1 breaks the 3g software unlock

2.2.1 does not break iPhone 2G unlock since the 2G baseband is not updated.(it hasn't been updated for 8 months)Don't Upgrade yet though . . .

For anyone that wants/needs to unlock the iPhone 3g do not update to 2.2.1 until the dev team releases a method (i.e. PwnageTool) for a 2.2.1 jailbreak/upgrade. If you upgrade to 2.2.1 your baseband will be upgraded and it is unclear if/when you will be able to unlock.

2.2.1 is a worthless upgrade
there is no reason to upgrade
and for the people that still dont get it
2.2.1 WILL BREAK YOUR JAILBREAKE AND FOR 3G USERS WILL BREAK YOUR UNLOCK AS IT CHANCES THE BASEBAND
FOR 2G USERS IF WILL BREAK YOUR JAILBREAK BUT IT WONT BREAK YOUR UNLOCK AS IT DOESN'T MODIFY THE BASEBAND
i dont see why ppl think they have to upgrade there phone every time apple brings out a upgrade just wait till the dev team spins there magic and comes out with the tools